Some of those are legitimate criticisms, but several of them seem sort of repeated (e.g. Fellaini criticism) or hair splitting after the fact. It really comes down to being too conservative, playing not to lose rather than to win. He didn't have a good transfer window last summer, that much is certain. Fellaini still looks like a panic buy after other deals fell through. This season has been pretty awful by the standards set by Ferguson, but even if he had stayed, United wouldn't have repeated their title-winning form this season.

Oh, without a doubt. Moyes' mistakes since taking over have been many. They've also been ridiculously magnified, because 1) Manchester United is one of the biggest clubs in the world, 2) United won the title last season under arguably their most iconic manager, and 3) Moyes has a different personality than Ferguson's fire, which by comparison makes him look weak under this kind of scrutiny.

He's managing a team of players that (except for Fellaini) are all accustomed to Ferguson's style. Believe it or not, Moyes' win percentage with United is higher than any other United coach except Ferguson (if Wikipedia is to be believed) so far, and there's still lots of room for improvement. Undoubtedly he could have done much better at several points this season. Sadly, he'll be let go before anybody really gets to see what he would have done over time.